Asskjhos to geneeai



Aug". 11, E925.

J. H. DAVIS INTERNAL COMBUSTION ENGINE Filed July 19, 1923 awwentoz Jaw? f7. DAV/5 @51 Mo, flbiiofommgx one n ion JikMEE-Z H, PAWS, F DJEYTON, 01 K116, AfiEIGNOR '20 GENERAL MOTQRS RESEARCH connorron, or neuron, euro,

INTWIAJL-OOME'MIIQN ENGINE.

To all whom it may concern:

Be it known thetd, JAMES, H. DAVIS, 21 citizen oi'ithe United States, ands, resident of Dayton, county out Montgomery, and

State of ()lzio, have invented certain new and useful Improvements in internal-Conibustion Engines, of which the following is a :tull, clear, concise, and exact description, such as will enable others skilled in the art to which the invention relates to make and use the same reference being made therein to the accompanying drawings, which form a part of this specification.

This invention relates to internal combustion engines and is illustrated as embodied in an engine for a tractor or other self-propeiled vehicle,

An object of the invention is to provide for exhausting the crank case of the engine to remove therefrom moisture andcombustihie vapors, and atomized particles of fuel and lubricanting oil; to minimize condensation and dilution of the lubricating oil in the crank As one means of achieving 4 this object the crank case may be connected with engine operated means such as the 'i'uei intake device, for effecting a flow of oer as to cause sucti n in lid in such a 111" the connections from the crank case. In the arrangement shown in the drawing the con nections from the cranl case are operated by being connected to the air intake of the carburetor. Preferably the connections are ar ranged between the carburetor and the air cleaner, and 1 consider it desirable also that air from the cleaner should be supplied to the crank case to provide. a circulation there through and back to the carburetor which will efl ectively sweep out the combustible and atomized fuel and oil.

From a slightly difi'ercnt point of view the invention may be regarded as providine for exhausting the crank case by means oi an outlet which is connected to a pipe through which a stream of fluid is passin to apply suction to the crank case connection on the ejector principle. Another feature of the invention in the illustrated form re lates to arranging an airinlet to the chunk case having a portion projecting into the conduit between the air cleaner and the carburetor, in such a manner that the stream of air sets up a pressure in the crank cese con- 3.92%. Serial Ho. 852,55tt

nection tending to feed the cleaned air therethrough. d

The above and other objects and features of the invention, including various novel combinations of parts and desirable particu lar constructions, will be apparent from the following description of the illustrative ombodirnent shown in the accompanying; drawing, in Which the figure is s top plan View, partly broken away, of an internal combustion engine equipped -Wltil means for err-- hausting the crank case as above described.

In the drawing the engine is indicated at 10 and the radiator at 12, the engine being supported on a crank cese i i and supplied "with a combustible mixture of air and first through an intake device 18 which includes a carburetor 18 supplied with air from a cleaner 26 through a conduit The the; is controlled by any suitable throttle control device 24. lhe above described parts may be,except as described below oi any :1 "red construction and are therefore not particw larly illustrated. but merely shown in conventional forms.

According to the present invention the conduit 22 is connected to the crank case 1% i by a pipe 26 leading from the front end of the crank ,case and exhausting into the conduit 22 at its rear end which is flush with the side of the conduit 22. this arrangement the suction of the fuel intake device, and the ejector efiectoi the stream of air in the conduit 22, combine to suck air from the crank case through the connection 26. To provide a circulation of clean air for this purpose, I prefer that the crank case be fun ther connected with the conduit QZ-by a con-- nection 28 which projects into the conduit 3 at its "front end and which opens into the crank on so at its rear end" Thus the stream of air iuthc conduit sets up a in the connection 28 tending to feed a part of the cleaned air vtherethrough into the, crank case, this pressure being in addition to the suction operating on the connection 26. By this arrangement it will be seen that there is a constant circulation of air from the cleaner through the crankcase 1 to the carburetor 18 which will effectively remove from the crank case all moisture and combustible vapors, atomized particles of fuel, u'nd oil.

the direction from Whichthe fluid. flows in such a manner that a part of the fluid flows through the connection to Wash out moisture and combustible :gases and atomized par ticles of fuel and oil from the crank case.

2. An internal combustion engine con1- prising, in combination, a crank case, an air-conduit, means operated by the engine for causing RrfiOW of air through the conduit, and a connection from the conduit to the crank case which projects into the conduit in the opposite direction. to the flow of air so that part of the air tends to pass into the crank case.

3. An internal combustion engine comprising, in combination, a crank case, a con duit, means operated by the engine for onusing it flow of fluid through the conduit, and a, pair of connections from the crank case to the conduit, one of which opens into the conduit in the direction of the flow of fluid therein so that the fluid by its flow exerts a. suction on the connection, and the other of which opens into the conduit in the opposite direction and projects into the conduit so that part of the fluid tends to' flow through said connection into the crank case,

by-Which arrangement there is whirculation 0:5 fluid from the conduit through the crank case and back to the conduit.

t. An internal-combustion engine comprising a crank case, an air intake conduit leading from atmosphere to the fuel intake of the engine, and plural conduits connecting said crank case and said air intake conduit for ceusing circulation through said crank case and intuke conduit.

5. An internal-combustion engine comprising a crank case, an air intake'conduit leading from atmosphere to the fuel intake of the engine, and plural conduits between said crunk case and said air intake conduit, one of said plural conduits having the end that connects with the air intake conduit facing in a direction opposite to the flow of air therein.

6. An internal-combustion engine con1- prising a crank case, an air intake conduit leading from atmosphere to the fuelintake of the engine, an air cleaner in said air intake conduit, and plural conduits connecting said crank case with said intake conduitat points between said air cleaner and the fuel intake of the engine.

7. An internal-combustion engine comprising a crank case having en air inlet and separate outlet for air and vapors, an air intake conduit leading from atn'iosiihere to the fuel intake of the engine; and an air cleaner in said air conduit, said air inlet comniunicating With the air intake between the air cleaner and thefuel intake of the engins.

In testimony whereof I afiix my signature.

3' Ali 19$ H. DAVIS. 

